how to fix P0171 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before working on it.

2. Inspect Air Intake System

• Tools Required: Vacuum gauge, flashlight
• Check all hoses connected to the air intake for cracks or disconnections.
• Inspect the intake manifold gasket for signs of wear or leaks.
• Use a vacuum gauge to test for excessive vacuum in the intake system.

3. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail test port and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position (without starting the engine) and observe the pressure reading.
• Compare the reading to the manufacturer’s specifications; if low, check the fuel pump and filter.

4. Check MAF Sensor

• Tools Required: Multimeter or MAF sensor cleaner
• Disconnect the MAF sensor connector and measure the voltage output while the engine is running.
• Consult the service manual for the specific voltage range. Clean the sensor if it appears dirty, and reconnect.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaner, socket set
• Remove the fuel injectors from the fuel rail.
• Inspect for any clogs or leaks. If necessary, use a fuel injector cleaning kit to clean them.

6. Replace Oxygen Sensors (if necessary)

• Tools Required: Oxygen sensor socket
• If the upstream oxygen sensor is faulty, carefully unscrew and replace it with a new sensor.
• Ensure it is torqued to the manufacturer’s specifications.